Statement Of Comprehensive Income [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5 8.6
GBP
|
58,600,000
GBP
|
–
GBP
|
–
GBP
|
38,600,000
GBP
|
–
GBP
|
–
GBP
|
38,600,000
GBP
|
| Other comprehensive income [abstract] | ||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3 8 .6
GBP
|
38 .6
GBP
|
–
GBP
|
–
GBP
|
2 7. 3
GBP
|
–
GBP
|
–
GBP
|
2 7. 3
GBP
|
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
9. 7
GBP
|
9,700,000
GBP
|
–
GBP
|
–
GBP
|
6. 8
GBP
|
–
GBP
|
–
GBP
|
6. 8
GBP
|
| Other comprehensive income | — | — | — | — | — |
23 .6
GBP
|
— | — | — | — | — |
21 . 5
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||
| Comprehensive income, attributable to owners of parent |
–
GBP
|
5,300,000
GBP
|
–
GBP
|
–
GBP
|
2 9.7
GBP
|
35,000,000
GBP
|
–
GBP
|
1 .0
GBP
|
59. 1
GBP
|
–
GBP
|
–
GBP
|
60. 1
GBP
|